feat: bulk upload for customer truck assignments

Add Excel template-based bulk upload for customer truck assignments
(self-haul + EDR). Supports up to 2x20ft or 1x40ft containers per truck.

API: POST /bookings/:id/customer-trucks/bulk accepts array of trucks.
Portal: DownloadTemplate → ParseExcel → PreviewUpload → Commit flow.
Validates truck load rules per booking container configuration.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

apps/edr-freight-api/src/modules/bookings/dto/bulk-customer-truck.dto.ts

@@ -0,0 +1,48 @@
+import { IsString, IsNotEmpty, IsIn, IsArray, ArrayMaxSize, ArrayUnique, Matches, IsOptional } from 'class-validator';
+import { CUSTOMER_TRUCK_TYPES } from './customer-truck-assignment.dto';
+
+export class BulkCustomerTruckRow {
+  @IsString()
+  @IsNotEmpty()
+  truckPlateNumber!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  driverName!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  @IsIn(CUSTOMER_TRUCK_TYPES)
+  truckType!: string;
+
+  @IsOptional()
+  @IsArray()
+  @ArrayMaxSize(2)
+  @ArrayUnique()
+  @Matches(/^[A-Z]{4}\d{7}$/, {
+    each: true,
+    message: 'each container must be ISO format (e.g. ABCD1234567)',
+  })
+  containerNumbers?: (string | null)[];
+}
+
+export class BulkCustomerTrucksDto {
+  @IsArray()
+  @ArrayMaxSize(100)
+  trucks!: BulkCustomerTruckRow[];
+}
+
+export interface BulkTruckUploadResult {
+  success: number;
+  failed: number;
+  errors: Array<{
+    row: number;
+    truck: string;
+    reason: string;
+  }>;
+  created: Array<{
+    truckPlateNumber: string;
+    driverName: string;
+    containers: number;
+  }>;
+}